196 KEY AND FLORA 
I. ASCLEPIODORA Gray. 
Plants much like Aseclepias, but the hoods without horns. 
Lobes of the corolla ascending or spreading. 
1. A. viridis Gray. Green Mitkweep. Stems about 1 ft. high, 
nearly smooth. Leaves alternate, short-petioled, oblong to ovate- 
lanceolate. Umbels clustered. Flowers about 1 in. in diameter, 
green with a purplish crown. In dry soil W. and S. 
Il. ASCLEPIAS L. 
Perennial herbs. Flowers in simple (usually many-flowered) 
umbels. Calyx small, 5-parted, its lobes reflexed. Corolla deeply 
5-parted, with reflexed lobes; crown of hoods and horns con- 
spicuous (Fig. 27, A, B). Stamens with their filaments united 
into a tube around the pistil and anthers attached to the stigma 
(Fig. 27, D, E); anther cells 2, each cell containing an elon- 
gated, pear-shaped, tough mass of pollen, a mass from one 
anther always paired with one from the adjoining anther and 
each two together suspended from one of the 5 split glands 
on the angles of the stigma (Fig. 27, D, FE). Ovaries 2; styles 
very short. Pods 2 or sometimes 1 and the other undeveloped. 
Seeds flat, each with a tuft of long, silky hairs. The flowers 
are pollinated by. insects, which get their feet entangled in 
the clefts of the glands (Fig. 27, g) and then carry off the 
pollen masses. 
1. A. tuberosa L. ButterFLy WEED, PLeuRiIsy Root. Stems 
roughish-hairy, 1-2 ft. high. Juice not milky. Leaves abundant, 
linear to lanceolate-oblong. Flowers showy, usually bright orange, 
in terminal cymose umbels. Horns nearly erect and slender. Pods 
nearly erect, covered with fine down. In dry fields. 
2. A.decumbens L. Recitininc ButTerFLy WEED. Much resem- 
bling A. tuberosa, but the stems reclining with the ends erect. Leaves 
elliptic or oblong. Umbels racemed along the branches. In dry soil. 
3. A. purpurascens L. Purrie Mitxweep. Stem 1-3 ft. high, 
somewhat branched above. Leaves 4-6 in. long, elliptical or nearly 
so, the upper ones taper-pointed, slightly velvety beneath, short- 
petioled. Umbels terminal. Flowers 1 in. long, dark purple; pedi- 
cels shorter than the peduncle; horn broadly scythe-shaped, with the 
point bent sharply inward. Dry soil. 
